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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...alundum cement is the best material for use as the insulating coating. This coating would have to be thick enough that its resistance is much higher than that of the resistor trough, or the current would divide, part passing through the resistor and part, from a through the coating into the molten metal, out through the coating at the other end, into b. If even two small cracks should allow the metal to reach the resistor, short-circuiting would begin. When it is considered that the coefficients of expansion of the coating and of the resistor may not be and probably are not the same, it is obvious that thermal expansion would itself tend to crack the coating. Added to this danger is that of cracking the coating when a heavy ingot is dropped accidentally into the trough. Figure 9.--Detail of Morgan furnace, three phrase. If this type has been developed to the extent that the resistor and coating in an 800-pound or a 1-ton furnace show a life long enough to make the type of any commercial value, unusual judgment must have been exercised in the selection of materials, and supremely skillful workmanship must have been used in molding the resistor Figure 10.--Conley crucible tilting furnace. and in applying the coating. No final conclusions on this type can be drawn until it has been operated under foundry conditions. Although the furnace was advertised as ready for use a couple of years ago on foundry test has yet been recorded, and the advertisements have not appeared in late issues of the periodicals formerly carrying them. CONLEY FUBNACE. The Conley92 furnace is another resistor furnace (see fig. 10) in which the metal is contained in a crucible integral with the resistor, "Conley, M. R., U. S. Tatents 769,250, Sept. 6, 1904 (application...show more

Product details

  • Paperback | 196 pages
  • 189 x 246 x 11mm | 358g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236613503
  • 9781236613509